Nanoglasses: A Way to Solid Materials with Tunable Atomic Structures and Properties |
| Journal |
Materials Science Forum (Volumes 584 - 586) |
| Volume |
Nanomaterials by Severe Plastic Deformation IV |
| Edited by |
Yuri Estrin and Hans Jürgen Maier |
| Pages |
41-48 |
| DOI |
10.4028/www.scientific.net/MSF.584-586.41 |
| Online since |
June, 2008 |
| Authors |
Herbert Gleiter
|
| Keywords |
Amorphous Material, Metallic Glasses, Molecular Dynamic Simulation, Nanocomposite, Sintering |
| Abstract |
Recently, a new class of materials - called nanoglasses - with a glassy structure was
synthesized. The novel feature of these materials is that the atomic structure in the entire volume of
the material as well as the density of the material can be tuned. Nanoglasses are generated by
introducing interfaces into metallic glasses on a nanometer scale. Interfaces in these nanoglasses
delocalize upon annealing, so that the free volume associated with these interfaces spreads
throughout the volume of the glass. This delocalization changes the atomic structure and the density
of the glass throughout the volume. In fact, by controlling the spacing between the interfaces
introduced into the glass as well as the degree of the delocalization (by modifying the annealing
time and/or annealing temperature), the atomic structures as well as the density (and hence all
structure/density dependent properties) of nanoglasses may be controlled. A comparable tuning of
the atomic structure/density of crystalline materials is not conceivable, because defects in crystals
do not delocalize upon annealing. |
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